Valve-operating mechanism for steam-engines.



PATENTED NOV :3, m6.

, LBNTZ; I VALVE OPERATING MECHANISM ma srmm EMHNE$.

A?PLIOATIQN FILED HOV. 17.1905.

A2 a Z W A Tray/m;

on. the former, and which is increased by HUGO LENTZ, OF BEltLlN, GEPtll/lnliY.

VALVE-OPERATING MECHANlSllJ'l FGF S SB'F'EAM ENQENEEW Specification of Letters Patent.

Patented H0113, 1906.

Aonlication filed November 17, 1905. Serial No. 287,830.

To all (F7L07IL if may concern:

Be it known that I, HUGO LENTZ, a subject of the Emperor of Germany, and a resident of Berlin, Germany, have invented certain new and useful Improvements in Valve- Operating -Mechanism for Steam-Engines and the Like, of which .the followingis a specification.

The present invention relates to a simple Valve-motion (puppet-valve gear) to be employed principally for high-speed or reversible power-enginessuch, forinstance, as steam-engines.

Reversible enginessuch, for instance, as marine enginesare generally provided with slide-valves or piston-valves driven by articulated link mechanism, such as Stephenson link-motion, &c. Owing to the great pressure caused by the "weight of the slides and owing to the friction between the slides and the valve-faces caused by the steam-pressulre t to frequently-occurring bending of the slide caused by the expansion of the material of un equal thickness byhigliersteam temperat urcs, greatrcs'istancc is caused to the driving mechanism, which requires the employment of a large amount of material in the construction of the individual parts. There is also caused a considerable amount of wear, and consequently ,much insecurltyol worklng. At the same time these disadvantages render dillicult the control for regulating and reversing, whereby special reversing-engines are. required for large engines. The steam distribution also is not enact.

The present invention aims to lighten the work of the valve-motion of reversible engines, such as marine engines, and to secure their management by employing a wheel in-' stead oi one or more cormecting-rods This wheel, being caused td, rockby the driving mechanism, will move as directly as possible the valves of the cylinder by its speciallyshaped rim. This invention. also renders possible the reversing by hand, thereby obviating the nec 'ty for a special-rcwersing-en gine. The. invention is characterized by a rocking wheel which moves directly all the inct and outlet valves of the cylinder by means of its curved cams.

1n the accompanying drawings, Figure 1 is a front View of the mechanism. Fig. 2 is a diagraimnatical View of the mechanism.

Fig. 3 1s a modified form of the cam.-

In Fig. 1, ff are the exhaust-valves, e e are the inlet-valves, of the engine. The valves are provided with rods 3, which are provided on their ends with rollers r. The perfect closing of the valves is insured by the spring :3. c is the wheel, which is provided on its rim with curved cams d. The Wheel a rocks on the axle b and is driven by the driving mechanism 0, which can of course be replaced by will be easily understood by all persons skilled in.the'art. By the rocking of the wheel the curved cams d will alternately move the rollers 7', which latter will at the same time raise the valves. The curved valves are so constructed as to gently raise the valves from their seats and afterward to quickly open them. They also act to close the valves quickly on the rocking of the wheel (I in thereverse direction and finally to set them gently on their seats without any shock or blow.

In Fig. 2 are indicated the forces P P of the valves. As the valve-rods sand also the rollers r move in straight lines and the rollers r at the same time are pressed against the any equivalent mechanism, as

and

cams (Z, the forces l and l are divided into the composing forces F and Q, F and Q. The lorccs F and F are neutralized by the straight sliding motion and exert no action upon the wheel a. The forces Q, and Q are;

neutralized, as reprealso almost completely sented in Fig. 3, because the axle b of the wheel a, which received in other construotions the sum of the two forces (,2 and Q, has in this such forces either completely neutralized or only receives the small difference of the iorces Q and Q. This fact is an extraordinary advantage, the good working of the distribution depending upon the. good condition of the' axle-bearing.

It is also seen by Figs. 2 and 3 that for the driving mechanism 0 the following advantages are obtained: First, the forces and axlepressure Q and Q are mutually neutralized, and the driving mechanism thus needs less power to operate it; second, the number of the individual parts of the steam-distribw tion apparatus are considerably reduced by the employment of a single wheel for all the four valves of the cylinder.

The wheel a. may also consist ot' several in.- dividual pieces which are rigidly fixed together, as shown in Fig. 2 0

Having now particularly described and ICC IEO

posite directions to each other, friction-rollers at their ends pressed on the periphery of the wheel-at four points diametrically opposed by pairs for the'purpoee-ofi relieving any pres- I sure-on the-axis of! the wheel, and: means-for roeki the wheel.

2. E e velvevmotion forhigh-speedeteemengine comps-ism rocking end controlling Wheel hevingourved oems on its periphery, valve-stems arranged by pairs on the same line in opposite dirootions,-friotion-rollers at their ends,pressecl on the periphery of the wheel'et four points diametrically opposed by peiieaml e hnlr' attached to 2. wheel and a v movable part of the engine for rocking the wheel.

3. A valve-motion for steam-engine comprising roekin cam or Wheel formed of two parts rigidlv ed together and keyed'on a commone e, each segment having curved cams on its periphery, valve-stems arranged by pairs on the same line in opposite directions, friction-rollers at their-end seed on the peri her-y of the Wheel at" g jints diametriea y opposed by pairs end p, link attached to the wheel "and a movable part of the engine for making the wheel.

In. testimony of-Whioh I heye hereunto placed my hand in the presence of two Witmesses.

HUGO LENTZ.

Witnesses WOLDEMAR HAUPT-, Hmnw H SB R. 

